WO2019075885A1 - 基于可控冲击波复合浪涌式增压注水的煤层气井改造方法 - Google Patents
基于可控冲击波复合浪涌式增压注水的煤层气井改造方法 Download PDFInfo
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- WO2019075885A1 WO2019075885A1 PCT/CN2017/116170 CN2017116170W WO2019075885A1 WO 2019075885 A1 WO2019075885 A1 WO 2019075885A1 CN 2017116170 W CN2017116170 W CN 2017116170W WO 2019075885 A1 WO2019075885 A1 WO 2019075885A1
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- water injection
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 122
- 230000035939 shock Effects 0.000 title claims abstract description 95
- 238000002347 injection Methods 0.000 title claims abstract description 92
- 239000007924 injection Substances 0.000 title claims abstract description 92
- 238000000034 method Methods 0.000 title claims abstract description 37
- 238000002407 reforming Methods 0.000 title claims abstract description 10
- 239000003245 coal Substances 0.000 claims abstract description 48
- 238000005086 pumping Methods 0.000 claims abstract description 11
- 238000005516 engineering process Methods 0.000 claims abstract description 6
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 claims description 80
- 239000002131 composite material Substances 0.000 claims description 20
- 238000004519 manufacturing process Methods 0.000 claims description 11
- 230000001186 cumulative effect Effects 0.000 claims description 7
- 239000007788 liquid Substances 0.000 claims description 5
- 230000008569 process Effects 0.000 claims description 5
- 230000003213 activating effect Effects 0.000 abstract 1
- 230000003068 static effect Effects 0.000 description 4
- 230000015572 biosynthetic process Effects 0.000 description 3
- 238000001179 sorption measurement Methods 0.000 description 3
- 230000006378 damage Effects 0.000 description 2
- 238000003795 desorption Methods 0.000 description 2
- 239000011148 porous material Substances 0.000 description 2
- 239000000243 solution Substances 0.000 description 2
- 230000000903 blocking effect Effects 0.000 description 1
- 238000005056 compaction Methods 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 230000006735 deficit Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000004880 explosion Methods 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
- 230000008595 infiltration Effects 0.000 description 1
- 238000001764 infiltration Methods 0.000 description 1
- 230000002401 inhibitory effect Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000002715 modification method Methods 0.000 description 1
- 238000000053 physical method Methods 0.000 description 1
- 239000011435 rock Substances 0.000 description 1
- 239000004576 sand Substances 0.000 description 1
- 230000000638 stimulation Effects 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
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Classifications
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/006—Production of coal-bed methane
Definitions
- the invention belongs to the technical field of energy exploitation, and particularly relates to a method for reforming a coalbed methane well based on a controlled shock wave composite surge type pressurized water injection.
- CBM is the cause of the country to actively support the cause, CBM production in 2010 of 10 billion national planning m 3, in which the ground pumping five billion m 3, pumping tunnel 5 billion m 3. The pumping of the tunnel has reached the planned output. Due to the limitation of coal seam reconstruction and gas well stimulation measures, the ground pumping has not yet reached the planned output.
- the traditional method of transforming the coal seam is to inject external liquid into the formation, which will inevitably cause damage to the coal seam.
- the static pressure due to hydraulic fracturing may cause the coal seam to be compacted, resulting in the coalbed methane well not producing gas;
- hydraulic power Fracturing measures can only form the effect of “line-like” or incomplete “reticulated” coal reservoirs. In fact, it is impossible to achieve regional infiltration in the true sense, and it is more difficult to lay the sand supporting the cracks into the coal seam cracks.
- the object of the present invention is to provide a method for reforming a coalbed methane well based on a controlled shock wave composite surge type pressurized water injection to overcome the disadvantages of the above conventional method.
- a method for rebuilding the ground-extracted coalbed methane well based on repeated controllable shock wave combined surge pressurized water injection is proposed. This method can improve the seepage capacity, analytical capacity and re-adsorption capacity of the coal seam without harming the coal seam. Finally, increase the production and production capacity of CBM wells.
- the technical solution of the present invention is: a coalbed methane well reforming method based on a controllable shock wave composite surge boosting water injection, which is special in that it comprises the following steps:
- the number of shock wave operations set in the step 3.2) is greater than 3 times, the set recording interval duration is 5 min, the set pressure value is 1 MPa, and the cumulative note set in the step 3.3)
- the water volume is 400m 3 ;
- the shock wave generated by the controllable shock wave generating device has a peak pressure greater than 200 MPa, the shock wave pulse width is greater than 50 ⁇ s, and the operating frequency is 120 s/time.
- the present invention also proposes another method for reconstructing a coalbed methane well based on a controlled shock wave composite surge pressurized water injection, which is characterized in that it comprises the following steps:
- the number of shock wave operations set in the step 3) is 5-10 times; the first water injection amount in the step 4.1) is set to 200 m 3 ; and the step 4.2) is set to a pressure value of 1 MPa.
- the initial water injection amount setting value is 200m 3 ; the cumulative water injection amount setting value of the step 4.3) is 600m 3 ; the shock wave peak pressure generated by the controllable shock wave generating device is greater than 200MPa, the shock wave pulse width is greater than 50 ⁇ s, and the working frequency is 120s/ Times.
- controllable shock wave technology used in the present invention is a purely physical method, which does not inject any foreign liquid into the coal seam, and thus does not harm the coal seam;
- the invention combines the dynamic pressure generated by the controllable shock wave technology and the static pressure of the water injection pressure, and the new crack generated by the shock wave can support the crack under the condition of water injection and pressure, and can be further extended. Cracks form a seam around the wellbore to expand the gas desorption area of the coal seam and avoid the compaction that may be caused by the static pressure of the traditional modification method acting on the coal seam.
- the peak value of the shock wave pressure used in the present invention is much larger than the compressive strength of the coal seam, the seam is formed in the original coal and left in the structural coal, and the non-connected pores, micro-cracks and the like in the coal seam are communicated to improve the coal seam. Seepage capacity.
- the shock wave used in the coal layer generates strong shear force at the interface of the medium with large wave impedance difference in the coal seam, and peels off the debris attached to the surface of the coal rock in the seepage channel such as pores and fissures of the coal seam.
- the coal seam blocking effect is removed and the coal seam seepage capacity is improved.
- the invention can segment the coal seam without using a packer, and can not only perform fine treatment on the coal seam, but also selectively perform treatment in a specific region.
- the pressurized water injection can make up for the insufficient formation pressure caused by the formation deficit, and can also promote the crack extension.
- Figure 1 is a schematic view of a wellhead connection of the present invention
- Figure 2 is a flow chart of the operation of the present invention.
- the reform method of coalbed methane well based on controlled shock wave composite surge boosting water injection combines the traditional static method with the dynamic method.
- the shock wave combined surge pressurized water injection method is divided into shock wave series surge boosting water injection.
- shock wave alternating surge boosting water injection two kinds of work processes.
- the controllable shock wave generating device uses a wire electric explosion plasma to drive the energetic material to generate a shock wave.
- the controllable shock wave cracks part of the coal seam. After creating new cracks in the coal seam, communicating and expanding the original fissures, these fissures are supported and extended under the water pressure of the wellbore, thereby improving the desorption and seepage capacity of the coal seam and inhibiting the coal seam. Re-adsorption capacity.
- the water injection speed when the water injection speed is fast, the single water injection amount is used as the control target, which is called the quantitative surge; when the water injection speed is slow, the water injection pressure is the control target, which is called the constant pressure surge.
- a method for reforming a coalbed methane well based on a controlled shock wave composite surge boosting water injection comprising the following steps:
- the inner diameter of the casing of the coalbed methane well is 118.6mm-127.3mm, and the diameter of the controllable shock wave generating equipment is 102mm. Due to the possibility of deformation of the casing of the coalbed methane well, the diameter of the controllable shock wave generating equipment is not The well is less than 108mm and the length is not less than 1.5m, and the well is drilled to 10m below the deepest working point to ensure the smooth down of the equipment.
- the shock wave generated by the controllable shock wave generating device has a peak pressure greater than 200 MPa, a shock wave pulse width greater than 50 ⁇ s, and an operating frequency of 120 s/time.
- a method for reforming a coalbed methane well based on a controlled shock wave composite surge boosting water injection comprising the following steps:
- the inner diameter of the casing of the coalbed methane well is 118.6mm-127.3mm, and the diameter of the controllable shock wave generating equipment is 102mm. Due to the possibility of deformation of the casing of the coalbed methane well, the diameter of the controllable shock wave generating equipment is not The well is less than 108mm and the length is not less than 1.5m, and the well is drilled to 10m below the deepest working point to ensure the smooth down of the equipment.
- the shock wave generated by the controllable shock wave generating device has a peak pressure greater than 200 MPa, a shock wave pulse width greater than 50 ⁇ s, and an operating frequency of 120 s/time.
- the controllable shock wave generating device described in the patent document disclosed in the publication No. CN105674818A can be used as a specific structure and principle of the specification, and other devices capable of generating a controllable shock wave can be used.
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Abstract
Description
Claims (10)
- 基于可控冲击波复合浪涌式增压注水的煤层气井改造方法,其特征在于:包括以下步骤:1)安装井口四通和电缆防喷器,其中井口四通下端与井口连接,上端与电缆防喷器连接,第一侧口连接高压注水管线,第二侧口连接压力表;2)将可控冲击波产生设备穿过电缆防喷器下入井中;3)关闭电缆防喷器,向煤层气井中注水,当注水压力达到煤层的抗压强度后,启动可控冲击波产生设备进行冲击波复合浪涌式注水增压作业;4)完成所有作业点后,打开井口四通和井口电缆防喷器,起出可控冲击波产生设备;5)下水泵、水管和抽水杆,根据排采工艺投入排采。
- 根据权利要求1所述的基于可控冲击波复合浪涌式增压注水的煤层气井改造方法,其特征在于:所述步骤3)具体如下:3.1)关闭井口电缆防喷器,通过高压注水管线向煤层气井中注水,当注水压力达到煤层的抗压强度后,停止加压并记录注水量,开始冲击波作业;3.2)每完成设定次数的冲击波作业后停止,每隔固定时长记录一次井口压力,直至井口压力下降到设定压力值以下时停止;3.3)重复步骤3.1)和步骤3.2)的操作,直至累计注水量达到设定值,完成作业。
- 根据权利要求2所述的基于可控冲击波复合浪涌式增压注水的煤层气井改造方法,其特征在于:所述步骤3.2)中设定的冲击波作业次数大于3次,所述设定的记录间隔时长为5min,所述设定压力值为1MPa;所述步骤3.3)中设定的累计注水量为400m 3;可控冲击波产生装置产生的冲击波峰值压力大于200MPa,冲击波脉宽大于50μs,工作频率为120s/次。
- 根据权利要求1或2或3所述的基于可控冲击波复合浪涌式增压注水的煤层气井改造方法,其特征在于:在安装井口四通和电缆防喷器之前采用通井规通井。
- 根据权利要求1或2或3所述的基于可控冲击波复合浪涌式增压注水的煤层气井改造方法,其特征在于:在安装井口四通和电缆防喷器之前起出井下所有生产管柱。
- 基于可控冲击波复合浪涌式增压注水的煤层气井改造方法,其特征在于:包括以下步骤:1)安装井口四通和电缆防喷器,其中井口四通下端与井口连接,上端与电缆防喷器连 接,第一侧口连接高压注水管线,第二侧口连接压力表;2)将可控冲击波产生设备穿过电缆防喷器下入井中;3)关闭井口电缆防喷器,给井筒注水,液面到达井口后,开始冲击波作业,完成每个作业点设定的作业次数后,起出井下冲击波产生设备;4)拆下电缆防喷器,封堵井口,开始浪涌式注水增压,达到注水量以后,拆下注水管;5)安装水泵、水管和抽水杆,根据排采工艺投入排采。
- 根据权利要求6所述的基于可控冲击波复合浪涌式增压注水的煤层气井改造方法,其特征在于:所述步骤4)具体如下:4.1)拆下电缆防喷器,封堵井口,通过高压注水管线向煤层气井注水增压,当压力达到作业煤层的抗压强度或者一次注水量达到设定值后停止注水;4.2)待注水压力自然下降到设定值以下时,再次向井筒注水加压,当压力达到作业煤层的抗压强度或者一次注水量达到设定值后停止注水;4.3)重复步骤4.1)和步骤4.2)在煤层中形成浪涌,当累计向井筒注入水量达到设定值以上时,完成作业。
- 根据权利要求7所述的基于可控冲击波复合浪涌式增压注水的煤层气井改造方法,其特征在于:所述步骤3)中设定的冲击波作业次数为5-10次;所述步骤4.1)中的一次注水量设定值为200m 3;所述步骤4.2)设定压力值为1MPa,一次注水量设定值为200m 3;所述步骤4.3)的累计注水量设定值为600m 3;可控冲击波产生装置产生的冲击波峰值压力大于200MPa,冲击波脉宽大于50μs,工作频率为120s/次。
- 根据权利要求6或7或8所述的基于可控冲击波复合浪涌式增压注水的煤层气井改造方法,其特征在于:在安装井口四通和电缆防喷器之前采用通井规通井。
- 根据权利要求6或7或8所述的基于可控冲击波复合浪涌式增压注水的煤层气井改造方法,其特征在于:采用通井规通井前起出井下所有生产管柱。
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